Railway applications - Braking - Empty-loaded changeover devices

This document is applicable to empty-loaded changeover devices designed to automatically sense when the load of a railway vehicle reaches a defined value (changeover mass), which represents the point at which the vehicle is classed as “loaded” and thereby requires the brake force to be adjusted accordingly to achieve the required brake performance. This document also covers manually operated empty-loaded changeover devices and the associated changeover plates.
This document specifies the requirements for the design, dimensions, manufacture and testing of empty-loaded changeover devices.

Bahnanwendungen- Bremse - Leer-Beladen-Umstellvorrichtungen

This document is applicable to empty-loaded changeover devices designed to automatically sense when the load of a railway vehicle reaches a defined value (changeover mass), which represents the point at which the vehicle is classed as “loaded” and thereby requires the brake force to be adjusted accordingly to achieve the required brake performance. This document also covers manually operated empty-loaded changeover devices and the associated changeover plates.
This document specifies the requirements for the design, dimensions, manufacture and testing of empty-loaded changeover devices.

Applications ferroviaires - Freinage - Dispositifs de changement de régime Vide-Chargé

Le présent document est applicable aux dispositifs de changement de régime « Vide-Chargé » destinés à détecter automatiquement le moment où la charge d’un véhicule ferroviaire atteint une valeur définie (masse de changement de régime) ; cette valeur représente le moment où le véhicule est classé comme «chargé» et de ce fait nécessite un ajustement de l’effort de freinage pour obtenir les performances de freinage requises. Le présent document couvre également les dispositifs de changement de régime Vide-Chargé à commande manuelle et les plaques de commutation associées.
Le présent document spécifie les exigences relatives à la conception, aux dimensions, à la fabrication et aux essais des dispositifs changement de régime Vide-Chargé.

Železniške naprave - Zavore - Avtomatsko menjalo "naloženo-prazno"

General Information

Status
Published
Public Enquiry End Date
31-Mar-2019
Publication Date
21-Feb-2021
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
18-Feb-2021
Due Date
25-Apr-2021
Completion Date
22-Feb-2021

Relations

Buy Standard

Standard
EN 15624:2021
English language
30 pages
sale 10% off
Preview
sale 10% off
Preview
e-Library read for
1 day
Draft
prEN 15624:2019
English language
32 pages
sale 10% off
Preview
sale 10% off
Preview
e-Library read for
1 day

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 15624:2021
01-april-2021
Nadomešča:
SIST EN 15624:2009+A1:2010
Železniške naprave - Zavore - Avtomatsko menjalo "naloženo-prazno"
Railway applications - Braking - Empty-loaded changeover devices
Bahnanwendungen- Bremse - Leer-Beladen-Umstellvorrichtungen
Applications ferroviaires - Freinage - Dispositifs de changement de régime Vide-Chargé
Ta slovenski standard je istoveten z: EN 15624:2021
ICS:
45.040 Materiali in deli za železniško Materials and components
tehniko for railway engineering
SIST EN 15624:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 15624:2021

---------------------- Page: 2 ----------------------
SIST EN 15624:2021


EN 15624
EUROPEAN STANDARD

NORME EUROPÉENNE

February 2021
EUROPÄISCHE NORM
ICS 45.040 Supersedes EN 15624:2008+A1:2010
English Version

Railway applications - Braking - Empty-loaded changeover
devices
Applications ferroviaires - Freinage - Dispositifs de Bahnanwendungen - Bremse - Leer-Beladen-
changement de régime vide-chargé Umstellvorrichtungen
This European Standard was approved by CEN on 20 December 2020.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.





EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 15624:2021 E
worldwide for CEN national Members.

---------------------- Page: 3 ----------------------
SIST EN 15624:2021
EN 15624:2021 (E)
Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Design and manufacture . 7
4.1 General . 7
4.2 Functional requirements. 7
4.2.1 General . 7
4.2.2 Automatic empty-loaded changeover device . 8
4.2.3 Pneumatic device characteristics. 9
4.2.4 Automatic hydraulic to pneumatic converter. 10
4.2.5 Automatic elastomeric to pneumatic converter . 10
4.2.6 Components for operation of the manual empty-loaded changeover device . 10
4.3 Shock and vibration . 11
4.4 Environmental conditions . 11
4.4.1 General . 11
4.4.2 Ambient temperature . 11
4.4.3 Altitude . 11
4.4.4 Humidity . 11
4.4.5 Rain . 12
4.4.6 Snow, ice and hail . 12
4.4.7 Solar radiation . 12
4.4.8 Pollution . 12
4.5 Design requirements regarding pressure stress . 12
4.6 Tightness . 12
4.7 Service life . 13
4.8 Compressed air quality . 13
4.9 Fire behaviour . 13
4.10 External appearance . 13
4.11 Pneumatic interfaces . 13
5 Type tests . 13
5.1 General . 13
5.2 Individual automatic empty-loaded changeover device type tests . 14
5.2.1 Test bench for individual automatic empty-loaded changeover device type tests . 14
5.2.2 Sampling for type tests . 14
5.2.3 Test requirements . 14
5.2.4 Check of physical and geometrical characteristics . 15
5.2.5 Tightness . 15
5.2.6 Changeover operation – empty to loaded . 16
5.2.7 Changeover operation – loaded to empty . 17
5.2.8 Response time – empty to loaded . 17
5.2.9 Response time – loaded to empty . 18
5.2.10 Shock and vibration tests . 18
5.2.11 Operation at extreme temperatures . 18
6 In-service assessment. 19
2

---------------------- Page: 4 ----------------------
SIST EN 15624:2021
EN 15624:2021 (E)
7 Designation . 20
8 Identification and marking . 20
8.1 Identification . 20
8.2 Changeover plate for the manual empty-loaded changeover device . 20
Annex A (informative) Assessment of an empty-loaded changeover device when fitted to a
vehicle . 21
A.1 General . 21
A.2 Design acceptance testing set-up . 21
A.3 Static testing . 21
A.3.1 Vehicle requirements . 21
A.3.2 Test procedures . 21
A.3.2.1 Changeover setting of automatic empty-loaded changeover devices . 21
A.3.2.1.1 Procedure . 21
A.3.2.1.2 Pass/fail criteria . 21
A.3.2.2 Effects on brake characteristics . 22
A.3.2.2.1 General . 22
A.3.2.2.2 Procedure . 22
A.3.2.2.3 Pass/fail criteria . 22
A.4 Running tests . 22
A.4.1 General . 22
A.4.2 Pneumatic empty-loaded changeover device – Air consumption . 22
A.4.2.1 Procedure . 22
A.4.2.2 Pass/fail criteria . 22
A.4.3 Pneumatic empty-loaded changeover device – Impact of vibrations on the output
signal . 23
A.4.3.1 Procedure . 23
A.4.3.2 Pass/fail criteria . 23
Annex B (informative) Examples of manual empty-loaded changeover device handles and
changeover plates . 24
Annex C (informative) Test bench diagram . 26
Annex D (normative) In-service assessment . 27
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 2016/797/EU aimed to be covered. 28
Bibliography . 30

3

---------------------- Page: 5 ----------------------
SIST EN 15624:2021
EN 15624:2021 (E)
European foreword
This document (EN 15624:2021) has been prepared by Technical Committee CEN/TC 256 “Railway
applications”, the secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by August 2021, and conflicting national standards shall be
withdrawn at the latest by August 2021.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 15624:2008+A1:2010.
The main changes compared to EN 15624:2008+A1:2010 are:
a) normative references have been updated;
b) terms and definitions have been revised;
c) requirements on design and manufacture have been revised;
d) requirements on materials have been removed;
e) requirements on type tests have been revised;
f) requirements on routine test and inspection have been removed;
g) requirements on type validation have been removed;
h) requirements on in-service assessment have been added;
i) requirements on installation validation and on documentation have been removed;
j) requirements on designation, identification and marking have been revised;
k) Annex ZA has been updated.
This document has been prepared under a standardization request given to CEN by the European
Commission and the European Free Trade Association, and supports essential requirements of
EU Directive 2016/797/EU.
For relationship with EU Directive 2016/797/EU, see informative Annex ZA, which is an integral part of
this document.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,
Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North
Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United
Kingdom.
4

---------------------- Page: 6 ----------------------
SIST EN 15624:2021
EN 15624:2021 (E)
1 Scope
This document is applicable to empty-loaded changeover devices. The purpose of such devices is the
generation of a load-related signal which causes the brake performance to be adjusted to the current
vehicle mass.
The manually operated empty-loaded changeover devices change their output signal according to the
position of the handles which together with the associated changeover plates serve as interfaces. The
changeover plates read the required information for the operation of the empty-loaded changeover
devices, i.e. brake weights for each position and the relevant changeover mass of the vehicle.
Automatic empty-loaded changeover devices sense a certain load threshold of the vehicle to
automatically adjust the output signal when the mass of a vehicle reaches a defined value. This threshold
is the changeover mass. Below this mass the vehicle’s brake system provides a reduced brake force. For
the changeover mass or more the high brake force applies.
This document specifies the requirements for the design, testing and quality assurance of empty-loaded
changeover devices.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 14478:2017, Railway applications — Braking — Generic vocabulary
EN 15625:2021, Railway applications — Braking — Automatic variable load sensing devices
EN 15877-1:2012+A1:2018, Railway applications — Marking on railway vehicles — Part 1: Freight
wagons
EN 45545-2:2020, Railway applications — Fire protection on railway vehicles — Part 2: Requirements for
fire behavior of materials and components
EN 60721-3-5:1997, Classification of environmental conditions — Part 3: Classification of groups of
environmental parameters and their severities — Section 5: Ground vehicle installations
(IEC 60721-3-5:1997)
EN 61373:2010, Railway applications — Rolling stock equipment — Shock and vibration tests
(IEC 61373:2010)
EN ISO 228-1:2003, Pipe threads where pressure-tight joints are not made on the threads — Part 1:
Dimensions, tolerances and designation (ISO 228-1:2000)
ISO 8573-1:2010, Compressed air — Part 1: Contaminants and purity classes
5

---------------------- Page: 7 ----------------------
SIST EN 15624:2021
EN 15624:2021 (E)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 14478:2017, EN 15625:2021
and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1
empty-loaded changeover device
device connected to the vehicle, which is either manually operated or responds automatically to a change
of vehicle load, thereby providing a load-related signal which changes at a certain vehicle mass threshold
(changeover mass) when the load is increased or when the load is decreased
3.2
positive load signal pressure device
empty-loaded changeover device that provides a positive output pressure in the loaded state
3.3
zero load signal pressure device
empty-loaded changeover device that exhausts the output pressure to nominally 0 bar in the loaded state
3.4
changeover mass
lowest value of vehicle mass at which it is deemed to be in the loaded state, thereby requiring the
adjustment of brake force to achieve the required brake performance
3.5
automatic variable load sensing device
weighing valve
device connected to the vehicle, which responds to the loading of that vehicle to provide a continuous
load proportional signal to the brake control device
Note 1 to entry: The load input is normally a share of the wagon’s mass because of the devices position in the
vehicle suspension system. The result is a pneumatic output signal pressure that can be any value between a
minimum at tare mass and a maximum at maximum mass. Most of the existing self-adjusting load-dependant brakes
generate the load signal using a weighing valve.
[SOURCE: EN 15625:2021, 3.1]
3.6
mechanically operated pneumatic device
device or mechanism which responds to a mechanical input by a change of the output pressure
[SOURCE: EN 15625:2021, 3.2]
3.7
hydraulic to pneumatic converter
device or mechanism which transforms a hydraulic pressure into a pneumatic pressure with a defined
transmission ratio
[SOURCE: EN 15625:2021, 3.3]
6

---------------------- Page: 8 ----------------------
SIST EN 15624:2021
EN 15624:2021 (E)
3.8
elastomeric to pneumatic converter
device or mechanism having both elastomeric and pneumatic components which transforms a pressure
in the elastomer into a pneumatic pressure with a defined transmission ratio
[SOURCE: EN 15625:2021, 3.4]
3.9
output signal pressure
load signal pressure
LSP
output pressure delivered by the empty-loaded changeover device, which signals the load state (either
empty or loaded) of the vehicle to the brake control device
3.10
supply pressure
input pressure to a pneumatic empty-loaded changeover device
3.11
normal litre
Nl
unit of amount of a gas equal to the amount of 1 l at a pressure of 1,0 bar and at a standard temperature,
at 20 °C
Note 1 to entry: Air flow is often stated in normal litres per minute (Nl/min).
4 Design and manufacture
4.1 General
The design and manufacture of the empty-loaded changeover device shall take the requirements of this
clause into account for all intended operating conditions.
4.2 Functional requirements
4.2.1 General
4.2.1.1 The empty-loaded changeover device shall supply a signal indicating the variation in vehicle
load (empty or loaded) to the braking control system; this shall be mechanical or pneumatic. The method
of producing the pneumatic signal shall be a mechanically operated pneumatic device, hydraulic to
pneumatic converter device or an elastomeric to pneumatic converter device.
4.2.1.2 The empty-loaded changeover device shall, in all cases, supply an output signal, which is a
function of the load.
4.2.1.3 The empty-loaded changeover device shall not alter any of the characteristics of the
distributor and/or any associated relay device, when fitted to a vehicle, thereby not altering the
characteristics of the brake system, other than to signal the load change and thereby cause the brake
cylinder pressure to change from one state to another.
4.2.1.4 The design of the empty-loaded changeover device shall either provide a positive output
pressure (positive load signal pressure device) or exhaust the output pressure to nominally 0 bar (zero
load signal pressure device) in the loaded state dependant on the applicable design requirements.
7

---------------------- Page: 9 ----------------------
SIST EN 15624:2021
EN 15624:2021 (E)
4.2.1.5 The air consumption of a pneumatic empty-loaded changeover device shall, during running
of the vehicle, be minimal and shall not interfere with the normal braking performance of that vehicle. A
test which can be used to confirm this is described in A.4.2.
4.2.2 Automatic empty-loaded changeover device
4.2.2.1 General
4.2.2.1.1 An automatic empty-loaded changeover device shall change from the empty to a loaded state
or vice versa, when the vehicle mass exceeds or falls below the changeover mass.
4.2.2.1.2 The automatic empty-loaded changeover device shall comply with the changeover values
specified in its technical specification.
Once fitted on the vehicle the changeover shall take place within ± 5 % of the defined changeover mass
of the vehicle.
For vehicles that operate only in empty or fully loaded states, this tolerance is in the range of ± 20 %.
NOTE A test which can be used to confirm this is described in A.3.2.1.
4.2.2.1.3 An automatic empty-loaded changeover device may have a damping facility within its
mechanism to prevent the effects of transient suspension movement from causing a change of the load
signal.
4.2.2.1.4 An automatic empty-loaded changeover device shall be designed to fit to a vehicle in a
position to sense the load change of that vehicle, causing a change of state/output signal of the changeover
device.
4.2.2.2 Changeover response
Where the empty-loaded changeover device does not include integral damping the response of the output
pressure shall be immediate, i.e. the pressure shall fall or increase dependent on the particular design of
the device, as soon as the device is moved from one state to another. Where the empty-loaded changeover
device has integral damping a delay in the LSP response shall be apparent.
4.2.2.3 Empty to loaded changeover
4.2.2.3.1 Integrally damped device supplied with air from the distributor auxiliary reservoir or
main reservoir pipe
Not earlier than 3 s after the operating mechanism was moved to the loaded position and remains there
the output pressure shall change to the loaded state for the particular design of the device as defined in
4.2.3. This shall be tested in accordance with 5.2.8.2.
When the operating mechanism is moved to the loaded position and kept there for less than 3 s the output
pressure shall not reach a value that causes a changeover to occur.
4.2.2.3.2 Device supplied with air from the distributor output pressure
When the operating mechanism is in the loaded position the output pressure shall remain in or change
to the loaded state during braking for the particular design of the device as defined in 4.2.3. This shall be
tested in accordance with 5.2.8.
When the brake is released there is no output pressure provided by the empty-loaded changeover device
regardless the position of the operating mechanism.
8

---------------------- Page: 10 ----------------------
SIST EN 15624:2021
EN 15624:2021 (E)
4.2.2.4 Loaded to empty changeover
4.2.2.4.1 Integrally damped device supplied with air from the auxiliary reservoir or main
reservoir pipe
Not earlier than 3 s after the operating mechanism was moved to the empty position and remains there
the output pressure shall change to the empty state for the particular design of the device as defined in
4.2.3. This shall be tested in accordance with 5.2.9.2.
When the operating mechanism is moved to the empty position and kept there for less than 3 s the output
pressure shall not reach a value that causes a changeover to occur.
4.2.2.4.2 Device supplied with air from the distributor output pressure
When the operating mechanism is in the empty position the output pressure shall remain in or change to
the empty state during braking for the particular design of the device as defined in 4.2.3. This shall be
tested in accordance with 5.2.9.
When the brake is released there is no output pressure provided by the empty-loaded changeover device
regardless the position of the operating mechanism.
4.2.3 Pneumatic device characteristics
4.2.3.1 The device shall be designed to accept a supply pressure directly from the vehicle’s auxiliary
reservoir or from the distributor output/brake cylinder pressure.
4.2.3.2 When the load signal is pneumatically transmitted to the brake control device, the changeover
device shall produce a step in LSP at a defined value of input signal representing the changeover mass
between the empty and loaded states.
4.2.3.3 Where the supply pressure to the empty-loaded changeover device is supplied from the
auxiliary reservoir the following shall apply.
a) For a positive load signal pressure device:
1) all values of the LSP of ≤ 0,5 bar shall indicate a vehicle load that is less than the changeover mass
with the purpose of causing the brake control device to output its lower ratio,
2) all values of the LSP of ≥ 3,0 bar shall indicate a vehicle load greater than the changeover mass
with the purpose of causing the brake control device to output its higher ratio. An LSP lower than
3,0 bar is acceptable to signal a vehicle load greater than the changeover mass, when an
automatic variable load sensing device is used as an automatic empty-loaded changeover device.
b) For a zero load signal pressure device:
1) all values of the LSP of ≥ 3,0 bar shall indicate a vehicle load that is less than the changeover mass
with the purpose of causing the brake control device to output its lower ratio,
2) all val
...

SLOVENSKI STANDARD
oSIST prEN 15624:2019
01-marec-2019
Železniške naprave - Zavore - Avtomatsko menjalo "naloženo-prazno"
Railway applications - Braking - Empty-loaded changeover devices
Bahnanwendungen- Bremse - Leer-Beladen-Umstellvorrichtungen
Applications ferroviaires - Freinage - Dispositifs de changement de régime Vide-Chargé
Ta slovenski standard je istoveten z: prEN 15624
ICS:
45.040 Materiali in deli za železniško Materials and components
tehniko for railway engineering
oSIST prEN 15624:2019 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
oSIST prEN 15624:2019

---------------------- Page: 2 ----------------------
oSIST prEN 15624:2019


DRAFT
EUROPEAN STANDARD
prEN 15624
NORME EUROPÉENNE

EUROPÄISCHE NORM

January 2019
ICS 45.040 Will supersede EN 15624:2008+A1:2010
English Version

Railway applications - Braking - Empty-loaded changeover
devices
Applications ferroviaires - Freinage - Dispositifs de Bahnanwendungen- Bremse - Leer-Beladen-
changement de régime Vide-Chargé Umstellvorrichtungen
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 256.

If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.


EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 15624:2019 E
worldwide for CEN national Members.

---------------------- Page: 3 ----------------------
oSIST prEN 15624:2019
prEN 15624:2019 (E)
Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Design and manufacture . 7
4.1 General . 7
4.2 Functional requirements. 7
4.2.1 General . 7
4.2.2 Automatic empty loaded changeover device . 7
4.2.3 Pneumatic device characteristics. 8
4.2.4 Automatic hydraulic to pneumatic converter. 9
4.2.5 Automatic elastomeric to pneumatic converter . 10
4.2.6 Components for operation of the manual empty-loaded changeover device . 10
4.3 Vibrations and shock . 10
4.4 Environment . 10
4.4.1 General . 10
4.4.2 Temperature . 11
4.4.3 Other environmental conditions . 11
4.5 Compressed air quality . 13
4.6 Service life . 13
4.7 Fire behaviour . 13
4.8 External appearance . 13
4.9 Design requirements regarding pressure stress . 13
4.10 Leakage . 14
4.11 Interfaces . 14
4.11.1 Mechanical . 14
4.11.2 Pneumatic . 14
5 Materials . 14
6 Type tests . 14
6.1 General . 14
6.2 Individual automatic empty-loaded changeover device type tests . 15
6.2.1 Test bench for individual automatic empty-loaded changeover device type tests . 15
6.2.2 Sampling for type tests . 15
6.2.3 Test requirements . 15
6.2.4 Check of physical and geometrical characteristics . 16
6.2.5 Leakage . 16
6.2.6 Changeover operation – empty loaded. 17
6.2.7 Changeover operation – loaded to empty . 18
6.2.8 Response time — empty to loaded. 19
6.2.9 Response time – loaded to empty . 19
6.2.10 Shock and vibration tests . 20
6.2.11 Operation at extreme temperature . 20
7 Routine test and inspection . 21
8 Type validation . 21
2

---------------------- Page: 4 ----------------------
oSIST prEN 15624:2019
prEN 15624:2019 (E)
9 Manual empty-loaded changeover device installation validation . 21
9.1 Equivalent handle movement . 21
9.2 Changeover plate alignment . 21
10 Documentation . 22
11 Designation . 22
12 Identification and marking . 22
12.1 Identification plate . 22
12.2 Changeover plate for the manual empty-loaded changeover device . 23
Annex A (informative) Assessment of an empty-loaded changeover device when fitted to a
vehicle . 24
A.1 Vehicle assessment – Testing set up . 24
A.2 Design acceptance testing set-up . 24
A.3 Single vehicle static testing . 24
A.3.1 Vehicle requirements . 24
A.3.2 Test procedures . 24
A.4 Running tests . 25
A.4.1 General . 25
A.4.2 Pneumatic empty-loaded changeover device – Air consumption . 25
A.4.3 Pneumatic empty-loaded changeover device – Output signal vibration . 25
Annex B (informative) Examples of manual empty-loaded changeover device handles and
changeover plates . 27
Annex C (informative) Test bench diagram . 29
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 2008/57/EC aimed to be covered. 30
Bibliography . 32

3

---------------------- Page: 5 ----------------------
oSIST prEN 15624:2019
prEN 15624:2019 (E)
European foreword
This document (prEN 15624:2019) has been prepared by Technical Committee CEN/TC 256 “Railway
applications”, the secretariat of which is held by DIN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 15624:2008+A1:2010.
This document has been prepared under a standardization request given to CEN by the European
Commission and the European Free Trade Association, and supports essential requirements of
EU Directive 2008/57/EC.
For relationship with EU Directive 2008/57/EC, see informative Annex ZA, which is an integral part of
this document.
4

---------------------- Page: 6 ----------------------
oSIST prEN 15624:2019
prEN 15624:2019 (E)
1 Scope
This document is applicable to empty-loaded changeover devices designed to automatically sense when
the load of a railway vehicle reaches a defined value (changeover mass), which represents the point at
which the vehicle is classed as “loaded” and thereby requires the brake force to be adjusted accordingly
to achieve the required brake performance. This document also covers manually operated empty-
loaded changeover devices and the associated changeover plates.
This document specifies the requirements for the design, dimensions, manufacture and testing of
empty-loaded changeover devices.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 14478, Railway applications — Braking — Generic vocabulary
EN 50125-1, Railway applications — Environmental conditions for equipment — Part 1: Rolling stock and
on-board equipment
EN 60721-3-5, Classification of environmental conditions — Part 3: Classification of groups of
environmental parameters and their severities — Section 5: Ground vehicle installations (IEC 60721-3-5)
EN 61373:2010, Railway applications — Rolling stock equipment — Shock and vibration tests
(IEC 61373:2010)
EN ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads — Part 1: Dimensions,
tolerances and designation (ISO 228-1)
ISO 8573-1:2010, Compressed air — Part 1: Contaminants and purity classes
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 14478 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
3.1
empty loaded changeover device
device connected to the vehicle, which is either manually operated or responds automatically to a
change of vehicle loading, thereby changing the state of the brake system at a defined value of vehicle
mass (changeover mass) either when the load is increased or when the load is decreased by providing a
signal to the brake control device
3.2
positive load signal pressure device
empty-loaded changeover device that provides a positive output pressure in the loaded state
5

---------------------- Page: 7 ----------------------
oSIST prEN 15624:2019
prEN 15624:2019 (E)
3.3
zero load signal pressure device
empty-loaded changeover device that exhausts the output pressure to nominally 0 bar in the loaded
state
3.4
changeover mass
lowest value of vehicle mass at which it is deemed to be in the loaded condition, thereby requiring the
adjustment of brake force to achieve the required brake performance
3.5
automatic variable load sensing device
device connected to the vehicle, which responds to the loading of that vehicle to provide a continuous
load proportional signal to the brake control device
3.6
mechanically operated pneumatic device
device or mechanism having both mechanical and pneumatic elements
3.7
hydraulic to pneumatic converter
device or mechanism which transforms the hydraulic pressure generated by the mass of the vehicle into
a pneumatic pressure with a defined relationship
3.8
elastomeric to pneumatic converter
device or mechanism having both elastomeric and pneumatic components, which transforms the
pressure in the elastomer generated by the mass of the vehicle into a pneumatic pressure with a defined
relationship
3.9
output signal pressure
load signal pressure
Lsp
output pressure delivered by the empty-loaded changeover device, which signals the load state (either
empty or loaded) of the vehicle to the brake control mechanism
3.10
supply pressure
input pressure of the air supply in a pneumatic empty-loaded changeover device
Note 1 to entry: Typically supplied from the vehicle distributor auxiliary reservoir, alternatively from the
vehicle distributor output pressure or from the brake cylinder pressure.
3.11
normal litre
Nl
unit of mass for gases equal to the mass of 1 l at a pressure of 1,013 2 bar (1 atmosphere) and at a
standard temperature, often 0 °C or 20 °C
Note 1 to entry: Airflow is often stated in normal litres per minute (Nl/min).
6

---------------------- Page: 8 ----------------------
oSIST prEN 15624:2019
prEN 15624:2019 (E)
4 Design and manufacture
4.1 General
The design and manufacture of the empty-loaded changeover device shall take the requirements of this
clause into account for all intended operating conditions.
4.2 Functional requirements
4.2.1 General
4.2.1.1 The empty-loaded changeover device shall supply a signal indicating the variation in vehicle
load (empty or loaded) to the braking control system; this shall be mechanical or pneumatic. The
method of producing the pneumatic signal shall be a mechanically operated pneumatic device,
hydraulic to pneumatic converter device or an elastomeric to pneumatic converter device.
4.2.1.2 The empty-loaded changeover device shall, in all cases, supply an output signal (Lsp), which
is a function of the load.
4.2.1.3 The empty-loaded changeover device shall not alter any of the characteristics of the
distributor and/or any associated relay device, when fitted to a vehicle, thereby not altering the
characteristics of the brake system, other than to signal the load change and thereby cause the brake
cylinder pressure to change between the two states.
4.2.1.4 The design of the empty-loaded changeover device shall either provide a positive output
pressure (positive load signal pressure device) or exhaust the output pressure to nominally 0 bar (zero
load signal pressure device) in the loaded state dependant on the applicable design requirements.
4.2.1.5 The air consumption of a pneumatic empty-loaded changeover device shall, during running
of the vehicle, be minimal and shall not interfere with the normal braking performance of that vehicle. A
test which can be used to confirm this is described in A.3.2.
4.2.2 Automatic empty loaded changeover device
4.2.2.1 General
4.2.2.1.1 An automatic empty-loaded changeover device shall change from the empty to loaded state
or vice versa, when the vehicle mass exceeds or falls below the changeover mass by a deliberate load
change.
4.2.2.1.2 When an automatic empty-loaded changeover device is fitted to a vehicle the changeover
shall take place within ± 5 % of the defined vehicle changeover mass. A test which can be used to
confirm this is described in A.3.2.1.
4.2.2.1.3 An automatic empty-loaded changeover device may have a damping facility within its
mechanism to prevent the effects of transient suspension movement from causing a change of the load
signal.
4.2.2.1.4 An automatic empty-loaded changeover device shall be designed to fit to a vehicle in a
position to sense the load change of that vehicle, causing a change of state of the changeover device.
This may be within the vehicle suspension system or linked to it, in order to sense the load change.
7

---------------------- Page: 9 ----------------------
oSIST prEN 15624:2019
prEN 15624:2019 (E)
4.2.2.2 Changeover response
Where the empty-loaded changeover device does not include integral damping the response of the
output pressure shall be immediate, i.e. the pressure shall fall or increase dependent on the particular
design of the device, as soon as the device is moved from one state to another. Where the empty-loaded
changeover device has integral damping a delay in the output pressure (Lsp) response shall be
apparent.
4.2.2.3 Empty to loaded changeover
4.2.2.3.1 Integrally damped device supplied with air from the d distributor auxiliary reservoir or
main reservoir
When the operating mechanism is moved to the loaded position and kept there for longer than 3 s the
output pressure shall change to the loaded condition pressure for the particular design of the device as
defined in 4.2.3. This shall be tested in accordance with 6.2.8.2.
When the operating mechanism is moved to the loaded position and kept there for less than 3 s the
output pressure shall not reach a value that causes a changeover to occur. This is tested in accordance
with 6.2.8.4.
4.2.2.3.2 Device supplied with air from the distributor output pressure
When the operating mechanism is moved to the loaded position the output pressure shall change to the
loaded condition for the particular design of the device as defined in 4.2.3. This shall be tested in
accordance with 6.2.8.
4.2.2.4 Loaded to empty changeover
4.2.2.4.1 Integrally damped device supplied with air from the distributor auxiliary
reservoir/main reservoir
When the empty-loaded changeover device is in the loaded state and the operating mechanism is
moved to the empty position and kept there for longer than 3 s the output pressure shall change to the
empty condition pressure for the particular design of the device as defined in 4.2.3. This shall be tested
in accordance with 6.2.9.2.
When the operating mechanism is moved to the empty position and kept there for less than 3 s the
output pressure shall not reach a value that causes a changeover to occur. This shall be tested in
accordance with 6.2.9.4.
4.2.2.4.2 Device supplied with air from the distributor output pressure
When the operating mechanism is moved to the empty position the output pressure shall change to the
empty condition for the particular design of the device as defined in 4.2.3. This shall be tested in
accordance with 6.2.9.
4.2.3 Pneumatic device characteristics
4.2.3.1 The device shall be designed to accept a pneumatic input pressure supplied direct from the
vehicle distributor auxiliary reservoir or from the distributor output/brake cylinder pressure system.
4.2.3.2 When the load is pneumatically transmitted to the brake control mechanism, the
changeover device shall produce a step-in output signal pressure (Lsp) at a defined value of changeover
mass between the empty and loaded conditions.
4.2.3.3 Where the input pressure to the empty-loaded changeover device is supplied from the
auxiliary reservoir the following shall apply.
8

---------------------- Page: 10 ----------------------
oSIST prEN 15624:2019
prEN 15624:2019 (E)
a) For a positive load signal pressure device:
1) all values of the output pressure (Lsp) of ≤ 0,5 bar shall indicate a vehicle load that is less than
the changeover mass with the purpose of causing the brake control device to output its lower
ratio,
2) all values of the output pressure (Lsp) of ≥ 3,0 bar shall indicate a vehicle load greater than the
changeover mass with the purpose of causing the brake control device to output its higher
ratio. A lower output signal pressure (Lsp) than 3,0 bar is acceptable to signal a vehicle load
greater than the changeover mass, when an automatic variable load sensing device is used as
an automatic empty-loaded changeover device.
b) For a zero-load signal pressure device:
1) all values of the output pressure (Lsp) of ≥ 3,0 bar shall indicate a vehicle load that is less than
the changeover mass with the purpose of causing the brake control device to output its lower
ratio,
2) all values of the output pressure (Lsp) of ≤ 0,5 bar shall indicate a vehicle load greater than the
changeover mass with the purpose of causing the brake control device to output its higher
ratio.
4.2.3.4 Where the input pressure is supplied from the distributor output/brake cylinder pressure
system the following shall apply.
a) For a positive load signal pressure device:
1) the value of the output signal pressure (Lsp) indicating a vehicle mass greater than the
changeover mass, shall be equivalent to the distributor output/brake cylinder pressure,
2) the value of the output signal pressure (Lsp) indicating a vehicle mass lower than the
changeover mass, shall be 0 bar.
b) For a zero-load signal pressure device:
1) the value of the output signal pressure (Lsp) indicating a vehicle mass greater than the
changeover mass, shall be 0 bar,
2) the value of the output signal pressure (Lsp) indicating a vehicle mass lower than the
changeover mass, shall be equivalent to the distributor output/brake cylinder pressure.
4.2.4 Automatic hydraulic to pneumatic converter
4.2.4.1 The load from the vehicle suspension applied mechanically to the empty-loaded changeover
device shall result in a change in state of the device as a consequence of a change in hydraulic pressure
within the device. This change of state shall occur at a defined value of vehicle mass (changeover mass)
and result in a step change in the pneumatic output signal pressure as in 4.2.3.
4.2.4.2 The design shall incorporate a method of ensuring that normal transient movements of the
vehicle suspension do not affect the state of the empty-loaded changeover device. This may be for
example achieved by incorporating a damping restriction in the hydraulic porting of the device.
9

---------------------- Page: 11 ----------------------
oSIST prEN 15624:2019
prEN 15624:2019 (E)
4.2.5 Automatic elastomeric to pneumatic converter
4.2.5.1 The load from the vehicle suspension applied mechanically to the empty-loaded changeover
device shall result in a change in state of the device as a consequence of a change in load on the
elastomeric element within the device. This change of state shall occur at a defined value of vehicle
mass (changeover mass) and result in a step change in the pneumatic output signal pressure as in 4.2.3.
4.2.5.2 The design shall incorporate a method of ensuring that normal transient movements of the
vehicle suspension do not affect the state of the empty-loaded change over device. This may be for
example achieved by elastomeric characteristic of the device.
4.2.6 Components for operation of the manual empty-loaded changeover device
4.2.6.1 When a vehicle is fitted with one “empty” brake system and one or several “loaded” brake
systems, changeover from one system to another shall be made by means of a cranked lever moving
perpendicular to the axles. See Figure B.1 for an example.
4.2.6.2 Operation of the manual empty-loaded changeover lever shall either act directly on a
mechanical linkage causing a change of lever ratio, or effect a changeover of a mechanical linkage via a
pneumatic device fitted to the mechanical lever arrangement.
4.2.6.3 For the “loaded” brake system corresponding to the changeover mass, the lever shall be
inclined towards the top on the right, making an angle of at least 90 ° with the “empty” position.
4.2.6.4 For the “empty” brake system, the changeover lever shall be inclined towards the top on the
left and occupy its extreme position on the left.
4.2.6.5 The lever position corresponding to more than one “loaded” position shall be between those
stated in 4.2.6.3 and 4.2.6.4 and increasing in power as from the left.
4.2.6.6 When the vehicle is fitted with one empty-loaded changeover device only, it shall have a
simple cranked lever only. See Figure B.1 a) for an example of the cranked lever form.
4.2.6.7 When the vehicle is fitted with two or more separate empty-loaded changeover devices, the
levers shall be cranked and have a double handle. See Fi
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.